Companion app sporadically can't connect to server

I find sporadically that the android app can’t connect to the server when on the home network. I get the attached error, net: ERR_NAME_NOT_RESOLVED.

The solution is to turn the WiFi off for ~7 seconds then turn it on, and it’s all fine.

It usually happens in the mornings, i.e. I notice when I first wake up. It’s not every morning - I can go a few days without issues, sometimes it’s every day…

Device info:
Pixel 7
Home Assistant Green
Google Nest Router

I assume this is a phone issue, but I can’t see what I’ve done to cause this… I’ve now given the bone assistant a fixed IP but that hasn’t changed anything…

thats a valid DNS error the app gets, seems to something with local DNS maybe?

Thanks, must be related to my router then which I’ll need to look into. It’s happened every morning the last few days which is odd… Will investigate.